CO2辅助蒸汽驱对四种钢的腐蚀性能影响模拟

doi:10.11885/j.issn.1674-5086.2017.05.02.02

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (4): 162-168.DOI: 10.11885/j.issn.1674-5086.2017.05.02.02

CO₂辅助蒸汽驱对四种钢的腐蚀性能影响模拟

石善志¹, 董宝军², 曾德智², 于会永¹, 陈禹欣¹

1. 新疆油田工程技术研究院, 新疆克拉玛依 834000;
2. “油气藏地质及开发工程”国家重点实验室·西南石油大学, 四川成都 610500

收稿日期:2017-05-02 出版日期:2018-08-01 发布日期:2018-08-01
通讯作者: 曾德智,E-mail:zengdezhi1980@163.com
作者简介:石善志,1978年生,男,汉族,辽宁大连人,高级工程师,主要从事油田工程技术及管理工作。E-mail:22319359@qq.com;董宝军,1989年生,男,汉族,甘肃金昌人,硕士研究生,主要从事井筒完整性、油气田腐蚀与防护方面的研究。E-mail:1977701443@qq.com;曾德智,1980年生,男,汉族,四川宜宾人,教授,主要从事油气田腐蚀与防护、石油管力学与环境行为方面的研究工作。E-mail:zengdezhi1980@163.com;于会永,1983年生,男,汉族,山东沂南人,高级工程师,主要从事采油工程技术方面的研究工作。E-mail:fcyhy@petrochina.com.cn;陈禹欣,1986年出生,男,汉族,黑龙江大兴安岭人,工程师,主要从事提高采收率、油气田腐蚀与防护方面的研究工作。E-mail:chenyx3@petrochina.com
基金资助:
国家自然科学基金（51774249，51374177）；国家科技重大专项（2016ZX05012-001）

Simulation of the Effect of Corrosion Performance of Four Types Under CO₂-assisted Steam Flooding Conditions

SHI Shanzhi¹, DONG Baojun², ZENG Dezhi², YU Huiyong¹, CHEN Yuxin¹

1. Research Institute of Engineering Technology, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2017-05-02 Online:2018-08-01 Published:2018-08-01

摘要/Abstract

摘要： CO₂辅助蒸汽驱是稠油开采的新型方式，但有关CO₂辅助蒸汽驱注气井中井下管柱CO₂腐蚀行为的研究较少。为此，利用高温高压釜模拟CO₂辅助蒸汽驱注气井筒工况，在CO₂分压为2 MPa，240 ℃的条件下，对4种常用的油套管钢进行了失重腐蚀挂片试验，得到了模拟工况下油套管钢的腐蚀速率，利用SEM观察了4种材质的微观腐蚀形貌，并采用SEM和EDS对4种管材的腐蚀产物进行了表征。结果表明，在实验条件下，4种材质的均匀腐蚀速率均小于油田的腐蚀控制指标（0.076 mm/a）；N80钢的腐蚀形态为均匀腐蚀，而3Cr、9Cr和13Cr钢的腐蚀形态为局部腐蚀；4种钢材的腐蚀速率均满足CO₂辅助蒸汽驱注气井筒腐蚀控制要求。

关键词: CO₂辅助蒸汽驱, CO₂腐蚀, 井下管柱, 腐蚀速率, 腐蚀形貌

Abstract: CO₂-assisted steam flooding is a novel method for heavy oil production. However, studies on CO₂ corrosion of downhole pipe in a high-temperature steam environment are relatively scarce. Therefore, in this study, the CO₂ corrosion behavior of oilfield pipe casing steel in a high-temperature steam environment was investigated using four types of oilfield pipe casing steel. A high-temperature, high-pressure autoclave was used to simulate the operating conditions during CO₂-assisted wellbore steam flooding. With a CO₂ partial pressure of 2 MPa and an operating temperature of 240℃, a weight loss coupon corrosion test was performed on four types of oilfield pipe casing steel, and the corrosion rates of the pipeline materials under the simulated operating conditions were obtained. Scanning electron microscopy, energy dispersive x-ray spectrometry, and x-ray diffraction were used to determine the morphology and composition of the corrosion products. The results show that under the experimental conditions, the uniform corrosion rates of the four types of materials were lower than the allowable corrosion rate for oil fields (0.076 mm/a). The corrosion morphology of N80 steel was uniform corrosion, while that of 3Cr, 9Cr, and 13CR steel were localized corrosion. The corrosion rates of all four steel materials met the corrosion control requirements for CO₂-assisted wellbore steam flooding.

Key words: CO₂-assisted steam flooding, CO₂ corrosion, downhole pipe, corrosion rate, corrosion morphology

中图分类号:

TE98

石善志, 董宝军, 曾德智, 于会永, 陈禹欣. CO₂辅助蒸汽驱对四种钢的腐蚀性能影响模拟[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 162-168.

SHI Shanzhi, DONG Baojun, ZENG Dezhi, YU Huiyong, CHEN Yuxin. Simulation of the Effect of Corrosion Performance of Four Types Under CO₂-assisted Steam Flooding Conditions[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 162-168.

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CO₂辅助蒸汽驱对四种钢的腐蚀性能影响模拟

Simulation of the Effect of Corrosion Performance of Four Types Under CO₂-assisted Steam Flooding Conditions

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